Green after it rains

[fatmoggy104]

Hi all,
Can anyone help me i look after a Old pool that is giving me a headache,
Everytime we get a rain storm the pool turns green. I went to the pool on Tuesday all was fine chlrorine was fine & PH 7.4 added chlorine tablets as normal into floater. Pump is running for 8hr a day & i changed the sand 6 months ago. It rained heavy last night & i got a call from the owner this morning the pool is turning green . Got there and yes it was starting to turn chemicals at Zero Ph at 8.0. Yesterday before the storm they where happily swimming in it. can anybody help with this Problem

[swimnsaveusa]

Hi all,
Can anyone help me i look after a Old pool that is giving me a headache,
Everytime we get a rain storm the pool turns green. I went to the pool on Tuesday all was fine chlrorine was fine & PH 7.4 added chlorine tablets as normal into floater. Pump is running for 8hr a day & i changed the sand 6 months ago. It rained heavy last night & i got a call from the owner this morning the pool is turning green . Got there and yes it was starting to turn chemicals at Zero Ph at 8.0. Yesterday before the storm they where happily swimming in it. can anybody help with this Problem

What are the CYA levels? Sounds like this may be your problem!

[fatmoggy104]

Not sure what CYA is we only have basic chemical test kit over here. But after reading other post about green pools i would say it is very high and there are quiet a few trees near the pool to add to the problem . what would be your solution to get the CYA down.

[swimnsaveusa]

Not sure what CYA is we only have basic chemical test kit over here. But after reading other post about green pools i would say it is very high and there are quiet a few trees near the pool to add to the problem . what would be your solution to get the CYA down.

Unfortunately, the only immediate way to remove cyanuric acid is to drain some water (6 or so inches) and replace it with fresh. However, it may be more or less depending on the CYA level, and the gallons in the pool. You really need to get a good test kit like the K-2005 or K-2006 by taylor. Another solution which can be a little costly temporarily is to raise your chlorine level to correspond with the high CYA. Since "normal" CYA is 30-50 ppm and that matches with 3 ppm chlorine, you will have to figure out what the CYA is to get your chlorine need. ie: CYA 100 = FC 9ppm approx. Also, when you superchlorinate, make sure you use calcium hypochlorite granule shock, or liquid chlorine (sodium hypochlorite) as neither will effect your CYA further. Anything with the word "stabilized or conditioned" will contain CYA (dichlor, trichlor). Chlorine tablets should only be used in moderation and you should be using liquid chlorine so you don't get CYA levels that are so high. If you have trees that hang over the pool and drop leaves in, you may also have a phosphate problem too which can lead to algae problems. You may want to have it checked for those too as phosphates are algae food!